1 /* ldlang.h - linker command language support
2 Copyright 1991, 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999, 2000,
4 Free Software Foundation, Inc.
6 This file is part of GLD, the Gnu Linker.
8 GLD is free software; you can redistribute it and/or modify
9 it under the terms of the GNU General Public License as published by
10 the Free Software Foundation; either version 2, or (at your option)
13 GLD is distributed in the hope that it will be useful,
14 but WITHOUT ANY WARRANTY; without even the implied warranty of
15 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 GNU General Public License for more details.
18 You should have received a copy of the GNU General Public License
19 along with GLD; see the file COPYING. If not, write to the Free
20 Software Foundation, 59 Temple Place - Suite 330, Boston, MA
27 lang_input_file_is_l_enum,
28 lang_input_file_is_symbols_only_enum,
29 lang_input_file_is_marker_enum,
30 lang_input_file_is_fake_enum,
31 lang_input_file_is_search_file_enum,
32 lang_input_file_is_file_enum
33 } lang_input_file_enum_type;
37 unsigned char data[1];
40 typedef struct statement_list {
41 union lang_statement_union *head;
42 union lang_statement_union **tail;
43 } lang_statement_list_type;
45 typedef struct memory_region_struct {
47 struct memory_region_struct *next;
51 bfd_size_type old_length;
54 boolean had_full_message;
55 } lang_memory_region_type;
57 typedef struct lang_statement_header_struct {
58 union lang_statement_union *next;
60 lang_output_section_statement_enum,
61 lang_assignment_statement_enum,
62 lang_input_statement_enum,
63 lang_address_statement_enum,
64 lang_wild_statement_enum,
65 lang_input_section_enum,
66 lang_object_symbols_statement_enum,
67 lang_fill_statement_enum,
68 lang_data_statement_enum,
69 lang_reloc_statement_enum,
70 lang_target_statement_enum,
71 lang_output_statement_enum,
72 lang_padding_statement_enum,
73 lang_group_statement_enum,
75 lang_afile_asection_pair_statement_enum,
76 lang_constructors_statement_enum
78 } lang_statement_header_type;
81 lang_statement_header_type header;
82 union etree_union *exp;
83 } lang_assignment_statement_type;
85 typedef struct lang_target_statement_struct {
86 lang_statement_header_type header;
88 } lang_target_statement_type;
90 typedef struct lang_output_statement_struct {
91 lang_statement_header_type header;
93 } lang_output_statement_type;
95 /* Section types specified in a linker script. */
106 /* This structure holds a list of program headers describing segments
107 in which this section should be placed. */
109 struct lang_output_section_phdr_list {
110 struct lang_output_section_phdr_list *next;
115 typedef struct lang_output_section_statement_struct {
116 lang_statement_header_type header;
117 union etree_union *addr_tree;
118 lang_statement_list_type children;
120 union lang_statement_union *next;
125 asection *bfd_section;
126 flagword flags; /* Or together of all input sections */
127 enum section_type sectype;
128 struct memory_region_struct *region;
129 struct memory_region_struct *lma_region;
133 int subsection_alignment; /* alignment of components */
134 int section_alignment; /* alignment of start of section */
136 union etree_union *load_base;
138 struct lang_output_section_phdr_list *phdrs;
139 } lang_output_section_statement_type;
142 lang_statement_header_type header;
143 } lang_common_statement_type;
146 lang_statement_header_type header;
147 } lang_object_symbols_statement_type;
150 lang_statement_header_type header;
153 asection *output_section;
154 } lang_fill_statement_type;
157 lang_statement_header_type header;
159 union etree_union *exp;
161 asection *output_section;
163 } lang_data_statement_type;
165 /* Generate a reloc in the output file. */
168 lang_statement_header_type header;
170 /* Reloc to generate. */
171 bfd_reloc_code_real_type reloc;
173 /* Reloc howto structure. */
174 reloc_howto_type *howto;
176 /* Section to generate reloc against. Exactly one of section and
177 name must be NULL. */
180 /* Name of symbol to generate reloc against. Exactly one of section
181 and name must be NULL. */
184 /* Expression for addend. */
185 union etree_union *addend_exp;
187 /* Resolved addend. */
188 bfd_vma addend_value;
190 /* Output section where reloc should be performed. */
191 asection *output_section;
193 /* VMA within output section. */
195 } lang_reloc_statement_type;
197 typedef struct lang_input_statement_struct {
198 lang_statement_header_type header;
199 /* Name of this file. */
200 const char *filename;
201 /* Name to use for the symbol giving address of text start */
202 /* Usually the same as filename, but for a file spec'd with -l
203 this is the -l switch itself rather than the filename. */
204 const char *local_sym_name;
209 file_ptr passive_position;
211 /* Symbol table of the file. */
213 unsigned int symbol_count;
215 /* Point to the next file - whatever it is, wanders up and down
218 union lang_statement_union *next;
219 /* Point to the next file, but skips archive contents */
220 union lang_statement_union *next_real_file;
224 /* 1 means search a set of directories for this file. */
225 boolean search_dirs_flag;
227 /* 1 means this is base file of incremental load.
228 Do not load this file's text or data.
229 Also default text_start to after this file's bss. */
231 boolean just_syms_flag;
233 /* Whether to search for this entry as a dynamic archive. */
236 /* Whether to include the entire contents of an archive. */
237 boolean whole_archive;
242 unsigned int globals_in_this_file;
246 } lang_input_statement_type;
249 lang_statement_header_type header;
251 lang_input_statement_type *ifile;
253 } lang_input_section_type;
256 lang_statement_header_type header;
258 union lang_statement_union *file;
259 } lang_afile_asection_pair_statement_type;
261 typedef struct lang_wild_statement_struct {
262 lang_statement_header_type header;
263 const char *filename;
264 boolean filenames_sorted;
265 struct wildcard_list *section_list;
266 boolean keep_sections;
267 lang_statement_list_type children;
268 } lang_wild_statement_type;
270 typedef struct lang_address_statement_struct {
271 lang_statement_header_type header;
272 const char *section_name;
273 union etree_union *address;
274 } lang_address_statement_type;
277 lang_statement_header_type header;
278 bfd_vma output_offset;
280 asection *output_section;
282 } lang_padding_statement_type;
284 /* A group statement collects a set of libraries together. The
285 libraries are searched multiple times, until no new undefined
286 symbols are found. The effect is to search a group of libraries as
287 though they were a single library. */
290 lang_statement_header_type header;
291 lang_statement_list_type children;
292 } lang_group_statement_type;
294 typedef union lang_statement_union {
295 lang_statement_header_type header;
296 lang_wild_statement_type wild_statement;
297 lang_data_statement_type data_statement;
298 lang_reloc_statement_type reloc_statement;
299 lang_address_statement_type address_statement;
300 lang_output_section_statement_type output_section_statement;
301 lang_afile_asection_pair_statement_type afile_asection_pair_statement;
302 lang_assignment_statement_type assignment_statement;
303 lang_input_statement_type input_statement;
304 lang_target_statement_type target_statement;
305 lang_output_statement_type output_statement;
306 lang_input_section_type input_section;
307 lang_common_statement_type common_statement;
308 lang_object_symbols_statement_type object_symbols_statement;
309 lang_fill_statement_type fill_statement;
310 lang_padding_statement_type padding_statement;
311 lang_group_statement_type group_statement;
312 } lang_statement_union_type;
314 /* This structure holds information about a program header, from the
315 PHDRS command in the linker script. */
318 struct lang_phdr *next;
327 /* This structure is used to hold a list of sections which may not
328 cross reference each other. */
330 struct lang_nocrossref {
331 struct lang_nocrossref *next;
335 /* The list of nocrossref lists. */
337 struct lang_nocrossrefs {
338 struct lang_nocrossrefs *next;
339 struct lang_nocrossref *list;
342 extern struct lang_nocrossrefs *nocrossref_list;
344 /* This structure is used to hold a list of input section names which
345 will not match an output section in the linker script. */
347 struct unique_sections {
348 struct unique_sections *next;
352 extern struct unique_sections *unique_section_list;
354 extern lang_output_section_statement_type *abs_output_section;
355 extern lang_statement_list_type lang_output_section_statement;
356 extern boolean lang_has_input_file;
357 extern etree_type *base;
358 extern lang_statement_list_type *stat_ptr;
359 extern boolean delete_output_file_on_failure;
361 extern const char *entry_symbol;
362 extern const char *entry_section;
363 extern boolean entry_from_cmdline;
364 extern lang_statement_list_type file_chain;
366 extern void lang_init PARAMS ((void));
367 extern struct memory_region_struct *lang_memory_region_lookup
368 PARAMS ((const char *const));
369 extern struct memory_region_struct *lang_memory_region_default
370 PARAMS ((asection *));
371 extern void lang_map PARAMS ((void));
372 extern void lang_set_flags PARAMS ((lang_memory_region_type *, const char *,
374 extern void lang_add_output PARAMS ((const char *, int from_script));
375 extern lang_output_section_statement_type *lang_enter_output_section_statement
376 PARAMS ((const char *output_section_statement_name,
377 etree_type * address_exp,
378 enum section_type sectype,
381 etree_type *subalign,
383 extern void lang_final PARAMS ((void));
384 extern void lang_process PARAMS ((void));
385 extern void lang_section_start PARAMS ((const char *, union etree_union *));
386 extern void lang_add_entry PARAMS ((const char *, boolean));
387 extern void lang_add_target PARAMS ((const char *));
388 extern void lang_add_wild
389 PARAMS ((struct wildcard_spec *, struct wildcard_list *, boolean));
390 extern void lang_add_map PARAMS ((const char *));
391 extern void lang_add_fill PARAMS ((fill_type *));
392 extern lang_assignment_statement_type * lang_add_assignment PARAMS ((union etree_union *));
393 extern void lang_add_attribute PARAMS ((enum statement_enum));
394 extern void lang_startup PARAMS ((const char *));
395 extern void lang_float PARAMS ((enum bfd_boolean));
396 extern void lang_leave_output_section_statement
397 PARAMS ((fill_type *, const char *, struct lang_output_section_phdr_list *,
399 extern void lang_abs_symbol_at_end_of PARAMS ((const char *, const char *));
400 extern void lang_abs_symbol_at_beginning_of PARAMS ((const char *,
402 extern void lang_statement_append PARAMS ((struct statement_list *,
403 union lang_statement_union *,
404 union lang_statement_union **));
405 extern void lang_for_each_input_file
406 PARAMS ((void (*dothis) (lang_input_statement_type *)));
407 extern void lang_for_each_file
408 PARAMS ((void (*dothis) (lang_input_statement_type *)));
409 extern void lang_reset_memory_regions PARAMS ((void));
410 extern bfd_vma lang_do_assignments
411 PARAMS ((lang_statement_union_type * s,
412 lang_output_section_statement_type *output_section_statement,
416 #define LANG_FOR_EACH_INPUT_STATEMENT(statement) \
417 lang_input_statement_type *statement; \
418 for (statement = (lang_input_statement_type *)file_chain.head;\
419 statement != (lang_input_statement_type *)NULL; \
420 statement = (lang_input_statement_type *)statement->next)\
422 extern void lang_process PARAMS ((void));
423 extern void ldlang_add_file PARAMS ((lang_input_statement_type *));
424 extern lang_output_section_statement_type *lang_output_section_find
425 PARAMS ((const char * const));
426 extern lang_input_statement_type *lang_add_input_file
427 PARAMS ((const char *name, lang_input_file_enum_type file_type,
428 const char *target));
429 extern void lang_add_keepsyms_file PARAMS ((const char *filename));
430 extern lang_output_section_statement_type *
431 lang_output_section_statement_lookup PARAMS ((const char * const name));
432 extern void ldlang_add_undef PARAMS ((const char *const name));
433 extern void lang_add_output_format PARAMS ((const char *, const char *,
434 const char *, int from_script));
435 extern void lang_list_init PARAMS ((lang_statement_list_type*));
436 extern void lang_add_data PARAMS ((int type, union etree_union *));
437 extern void lang_add_reloc
438 PARAMS ((bfd_reloc_code_real_type reloc, reloc_howto_type *howto,
439 asection *section, const char *name, union etree_union *addend));
440 extern void lang_for_each_statement
441 PARAMS ((void (*func) (lang_statement_union_type *)));
442 extern PTR stat_alloc PARAMS ((size_t size));
443 extern void dprint_statement PARAMS ((lang_statement_union_type *, int));
444 extern bfd_vma lang_size_sections
445 PARAMS ((lang_statement_union_type *s,
446 lang_output_section_statement_type *output_section_statement,
447 lang_statement_union_type **prev, fill_type *fill,
448 bfd_vma dot, boolean *relax));
449 extern void lang_enter_group PARAMS ((void));
450 extern void lang_leave_group PARAMS ((void));
451 extern void lang_add_section
452 PARAMS ((lang_statement_list_type *ptr, asection *section,
453 lang_output_section_statement_type *output,
454 lang_input_statement_type *file));
455 extern void lang_new_phdr
456 PARAMS ((const char *, etree_type *, boolean, boolean, etree_type *,
458 extern void lang_add_nocrossref PARAMS ((struct lang_nocrossref *));
459 extern void lang_enter_overlay PARAMS ((etree_type *, etree_type *, int));
460 extern void lang_enter_overlay_section PARAMS ((const char *));
461 extern void lang_leave_overlay_section
462 PARAMS ((fill_type *, struct lang_output_section_phdr_list *));
463 extern void lang_leave_overlay
464 PARAMS ((fill_type *, const char *, struct lang_output_section_phdr_list *,
467 extern struct bfd_elf_version_tree *lang_elf_version_info;
469 extern struct bfd_elf_version_expr *lang_new_vers_pattern
470 PARAMS ((struct bfd_elf_version_expr *, const char *, const char *));
471 extern struct bfd_elf_version_tree *lang_new_vers_node
472 PARAMS ((struct bfd_elf_version_expr *, struct bfd_elf_version_expr *));
473 extern struct bfd_elf_version_deps *lang_add_vers_depend
474 PARAMS ((struct bfd_elf_version_deps *, const char *));
475 extern void lang_register_vers_node
476 PARAMS ((const char *, struct bfd_elf_version_tree *,
477 struct bfd_elf_version_deps *));
478 boolean unique_section_p PARAMS ((const char *));
479 extern void lang_add_unique PARAMS ((const char *));